import { Body, Controller, Delete, Get, Param, Post, Patch, UseGuards, Query, Req } from '@nestjs/common';
import { ApiTags, ApiOperation, ApiBearerAuth, ApiResponse, ApiQuery } from '@nestjs/swagger';
import { BookingsService } from './bookings.service';
import { GuestBookingService } from './guest-booking.service';
import { CreateBookingDto, ModifyBookingDto, CancelBookingDto } from './bookings.dto';
import { CreateGuestBookingDto, GetSavedPassengersDto } from './guest-booking.dto';
import { JwtGuard } from '../../common/jwt.guard';
import { IamGuard } from '../../common/iam-adapter';

@ApiTags('Booking')
@Controller('bookings')
export class BookingsController {
  constructor(
    private service: BookingsService,
    private guestService: GuestBookingService,
  ) {}
  
  @Get('my/bookings')
  @UseGuards(JwtGuard)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ 
    summary: 'Get logged-in user\'s booking history',
    description: 'Returns all bookings for the authenticated user with schedule and payment details'
  })
  @ApiQuery({ name: 'search', required: false, description: 'Search by booking reference or station names' })
  @ApiQuery({ name: 'status', required: false, description: 'Filter by booking status' })
  @ApiQuery({ name: 'page', required: false, description: 'Page number' })
  @ApiQuery({ name: 'pageSize', required: false, description: 'Items per page' })
  @ApiResponse({ status: 200, description: 'List of user bookings with schedule and passenger details' })
  getMyBookings(
    @Req() req: any,
    @Query('search') search?: string,
    @Query('status') status?: string,
    @Query('page') page?: string,
    @Query('pageSize') pageSize?: string,
  ) {
    const passengerId = req.user?.passengerId;
    if (!passengerId) throw new Error('Passenger ID not found in token');
    return this.service.findByPassengerId(passengerId, { 
      search, 
      status, 
      page: page ? parseInt(page) : 1, 
      pageSize: pageSize ? parseInt(pageSize) : 20 
    });
  }
  
  @Get()
  @ApiOperation({ 
    summary: 'List all bookings with filters (Admin/Agent)',
    description: 'Returns paginated list of bookings with search and status filters'
  })
  @ApiQuery({ name: 'search', required: false, description: 'Search by booking reference, email, or phone' })
  @ApiQuery({ name: 'status', required: false, description: 'Filter by booking status' })
  @ApiQuery({ name: 'page', required: false, description: 'Page number' })
  @ApiQuery({ name: 'pageSize', required: false, description: 'Items per page' })
  findAll(
    @Query('search') search?: string,
    @Query('status') status?: string,
    @Query('page') page?: string,
    @Query('pageSize') pageSize?: string,
  ) {
    return this.service.findAll({ 
      search, 
      status, 
      page: page ? parseInt(page) : 1, 
      pageSize: pageSize ? parseInt(pageSize) : 20 
    });
  }
  
  @Post('guest')
  @ApiOperation({ 
    summary: 'Create guest booking without login (optional account creation)',
    description: `Creates a booking without requiring login. Features:
    
**Guest Checkout:**
- No login required
- Contact details from first passenger
- Booking confirmation sent to email/phone

**Optional Account Creation:**
- Set createAccount=true with password
- Account created using first passenger details
- Automatic login after booking
- Loyalty points and wallet created

**Passenger Details Storage:**
- savePassengerDetails=true: Save for future bookings
- Stored by userId (if account created) or deviceId
- Retrieve saved passengers for quick booking

**Verifayda Verification:**
- Ethiopian nationals: National ID verified via Verifayda
- Other nationals: Passport details (no verification)

**Age-Based Pricing:**
- ADULT (≥5 years): Full fare
- CHILD (<5 years): First child FREE, subsequent children full fare`
  })
  @ApiResponse({ status: 201, description: 'Booking created successfully' })
  @ApiResponse({ status: 400, description: 'Verifayda verification failed or invalid data' })
  createGuest(@Body() dto: CreateGuestBookingDto) { 
    return this.guestService.createGuestBooking(dto); 
  }

  @Get('saved-passengers')
  @ApiOperation({ 
    summary: 'Get saved passenger profiles',
    description: 'Retrieve saved passenger details by userId (if logged in) or deviceId (for guest users)'
  })
  @ApiResponse({ status: 200, description: 'List of saved passenger profiles' })
  getSavedPassengers(@Query() query: GetSavedPassengersDto) {
    return this.guestService.getSavedPassengers(undefined, query.deviceId);
  }
  
  @Post()
  @UseGuards(JwtGuard)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ 
    summary: 'Create booking (requires login)',
    description: `Creates a booking for logged-in users with saved passenger profiles.
    Use POST /bookings/guest for guest checkout without login.`
  })
  @ApiResponse({ status: 201, description: 'Booking created with fare breakdown' })
  @ApiResponse({ status: 400, description: 'Verifayda verification failed or invalid passenger data' })
  @ApiResponse({ status: 404, description: 'Trip or seat hold not found' })
  create(@Body() dto: CreateBookingDto) { 
    return this.service.create(dto); 
  }
  
  @Get(':bookingRef')
  @ApiOperation({ 
    summary: 'Get booking details by reference (no auth required)',
    description: 'Returns booking with passenger categories, Verifayda verification status, and multi-currency amounts. Works for both guest and authenticated bookings.'
  })
  @ApiResponse({ status: 200, description: 'Booking details with adult/child counts and currency conversion' })
  @ApiResponse({ status: 404, description: 'Booking not found' })
  getByRef(@Param('bookingRef') ref: string) { 
    return this.service.getByRef(ref); 
  }
  
  @Patch(':bookingRef/modify')
  @UseGuards(JwtGuard)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ 
    summary: 'Modify booking seats or trip',
    description: 'Allows modification of confirmed bookings before departure'
  })
  @ApiResponse({ status: 200, description: 'Booking modified successfully' })
  @ApiResponse({ status: 400, description: 'Cannot modify cancelled or past bookings' })
  modify(@Body() dto: ModifyBookingDto) {
    return this.service.modify(dto);
  }
  
  @Delete(':bookingRef')
  @UseGuards(JwtGuard)
  @ApiBearerAuth('JWT-auth')
  @ApiOperation({ 
    summary: 'Cancel booking with refund',
    description: 'Cancels booking and processes refund (80% for confirmed bookings)'
  })
  @ApiResponse({ status: 200, description: 'Booking cancelled with refund amount' })
  @ApiResponse({ status: 400, description: 'Booking already cancelled' })
  cancel(@Param('bookingRef') ref: string, @Body() dto: CancelBookingDto) { 
    return this.service.cancel(ref, dto.reason); 
  }
}